Flying-machine propulsion



2 SHEETS-SHEET 1 Jan. 30, 1923.

' C DORNIER FLYING MACHINE PROPULSION- F| LED MAR. 31 1921 INVETOR;

' C. DORNIER.

Jan. 30, 1923. 1,443,567

FLYING MACHINE PROPULSION.

Fl LED MAR. 31'. I921 2 SHEETSSHEET 2 INVENTUR M MM.

Patented Jan. 30 1923.

CLAUDIUS DORNIER, OF FRIEDRICHSHAFEN, GERMANY, ASSIGNOR, BY MESNEASSIGNMENTS, T0 HIMSELF AN D DORNIEB, METALLBAUTEN GESELLSC HAFT MITBESCHRANKTE HAFTUNG.

FLYING-MACHINE PROPULSION.

Application filed March 31, 1921. Serial K0 4 51542.

To all whom it may concern:

Be it known that I, OLAUDIUS D'ORNIER, a citizen of. the German Empire,residing at Friedrichshafen, Germany, have invented certain new anduseful Improvements in Flying-Machine Propulsion, of which the followingis a specification,

My invention relates to flyingmachines and its particular object is torender flying machines capable of varying their speed within widelimits. Ever since the beginning of high speed flying, one of theobjects aimed at has been to increase the difference between the maximumand the minimum fly ing speed. The only means which has hitherto beenfound practicable, and which consisted in increasing the size of thesupporting planes while at the same time lessenlng the objectionableresistance, however, only solved the problem within very narrow limits,whereas, on the other hand, the helicopters, which had been proposed ingreat numbers, and whichpromised a more satisfactory solution of theproblem involved, all failed on account of insurmountable diflicultiesof construction.

It.is with due regard to these facts that my invention will be found tocover a form of flying machine construction, which may be readilyrealized practically and which allows of the speed of flight to'bevaried within wide limits, and thi by means of a flying machine thetraction propeller of which is firmly lodged, together with therespecial advantage to so dispose their pivot,

that the weights of the said propelling sets will be either entirely,-orat least partially balanced relatively to their pivots; Itwill be foundthat for purpose of securing the aforesaid balancing use may also bemade with much advantage of the receptacles of fuel, oil or otherrunning material, and that I was PTNT are.

by suitably positioning them within the machine.

Generally speaking, the propelling sets will be rotated about theirpoints only into two positions, i. e., a horizontal for high speeds, anda vertical one for low speeds. However, by suitable means the saidpropelling sets may also be rotated into intermediate positions. I

In th drawings affixed to this specification and forming part thereof aflying machine embodying my invention is illustrated by way of example.In the drawing- Fig. 1 is a side elevation Fig. 2 a plan view, and

Fig. 3 a front elevation of a monoplane, in which the lateral motor setsare adapted to be rotated, separately, about a horizontal axls.

,Referring to the drawing, the stationarymotor 1 (Fig. 1), disposed inthe forward end of the flying machine serves to drive a tractionpropeller 2. The side motors 3 are lodged to rotate, together with theirrespective propellers 4 about a pivot 5. If high speed be required, thenthe propellers i operate, with the drivingvshaft in horizontal position,as pressure propellers. If now the speed is to be reduced, then the moto3 and propellers t are rotated into thepos'tions 3' and a, respectively,in the direction indicated by the arrow 6, so that the propellers 4 willnow come to act as lifting propellers.

The invention is mainly intended for monoplanes with self supportingwings requiring no special staying means, since it is in connection withthis particular form of construction that the advantages peculiar to myinvention may be fully utilized. However, there is nofundamental'objection to applying my invention also to other forms 0flying machines, and in the same way, the invention may be successfullyrealized in the case of flying machine having more than three motors.

I claim: I

In an aeroplane incombination, a hull and a supporting plane connectedwith said hull, a stationary motor on said 'hull and a trac-' tionpropeller operatively connected with said motor and disposed in front ofsaid supporting plane, a motor pivotally suspended on either side ofsaid hull, immediately below said supporting plane and adapted to rockthrough an angle of 90 about a horizontal axis extending trans verselyto said hull and a pressure propeller operatively associated to eachrookable m0- tor in such a way as to press the air rear- Wards, Wheneverits shaft extends horizontally, or downwards, When its shaft is directed vertically. V

lntestiinony, whereof I aflix my signature.

- CLAUDIUS DORNIER.

